A joker maybe, but angry (4)
I believe the answer is:
'angry' is the definition.
(I know that angry can be written as wild)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for wild that I've seen before include "Unrestrained" , "Savage" , "Not domesticated" , "Feral - crazy" , "Impulsive" .)